package containers;

//: containers/Bits.java
// Demonstration of BitSet.
import static net.mindview.util.Print.print;

import java.util.BitSet;
import java.util.Random;

public class Bits {
	public static void printBitSet(BitSet b) {
		print("bits: " + b);
		StringBuilder bbits = new StringBuilder();
		for (int j = 0; j < b.size(); j++)
			bbits.append(b.get(j) ? "1" : "0");
		print("bit pattern: " + bbits);
	}

	public static void main(String[] args) {
		Random rand = new Random(47);
		// Take the LSB of nextInt():
		byte bt = (byte)rand.nextInt();
		BitSet bb = new BitSet();
		for (int i = 7; i >= 0; i--)
			if (((1 << i) & bt) != 0)
				bb.set(i);
			else
				bb.clear(i);
		print("byte value: " + bt);
		printBitSet(bb);

		short st = (short)rand.nextInt();
		BitSet bs = new BitSet();
		for (int i = 15; i >= 0; i--)
			if (((1 << i) & st) != 0)
				bs.set(i);
			else
				bs.clear(i);
		print("short value: " + st);
		printBitSet(bs);

		int it = rand.nextInt();
		BitSet bi = new BitSet();
		for (int i = 31; i >= 0; i--)
			if (((1 << i) & it) != 0)
				bi.set(i);
			else
				bi.clear(i);
		print("int value: " + it);
		printBitSet(bi);

		// Test bitsets >= 64 bits:
		BitSet b127 = new BitSet();
		b127.set(127);
		print("set bit 127: " + b127);
		BitSet b255 = new BitSet(65);
		b255.set(255);
		print("set bit 255: " + b255);
		BitSet b1023 = new BitSet(512);
		b1023.set(1023);
		b1023.set(1024);
		print("set bit 1023: " + b1023);
	}
} /* Output:
byte value: -107
bits: {0, 2, 4, 7}
bit pattern: 1010100100000000000000000000000000000000000000000000000000000000
short value: 1302
bits: {1, 2, 4, 8, 10}
bit pattern: 0110100010100000000000000000000000000000000000000000000000000000
int value: -2014573909
bits: {0, 1, 3, 5, 7, 9, 11, 18, 19, 21, 22, 23, 24, 25, 26, 31}
bit pattern: 1101010101010000001101111110000100000000000000000000000000000000
set bit 127: {127}
set bit 255: {255}
set bit 1023: {1023, 1024}
*///:~
